桉树枝瘿姬小蜂对桂中桉树幼林的危害调查及防治

Damage Investigation and Control on Leptocybe invasa for Young Eucalyptus Plantations in Central Guangxi

桉树枝瘿姬小蜂(Leptocybe invasa Fisher et La Salle)是近年在我国南方发生的危险性害虫。为掌握该虫对广西桂中地区主栽桉树无性系品种幼林的危害情况,进行实地调查和防治试验,结果表明:巨圆桉DH201-2受害严重,属高感品种;巨尾桉GL9和尾巨桉DH32-29受害轻,属轻感品种;尾巨桉DH32-26受害轻微,属抗虫品种。全年虫瘿密度消长呈现3峰型,峰值分别出现在5、7、10月。使用溴氰菊酯、噻虫啉药剂防治,虫瘿减退率分别为52.94%、74.79%,与对照比防治效果极显著;以全面淘汰高度感虫品种巨圆桉DH201-2为主的林业技术防治,巨尾桉GL9品种的虫瘿减退率可达81.58%,显著减轻桉树枝瘿姬小蜂的危害。

Leptocybe invasa is dangerous pest occurred in southern China. In order to grasp the damage of the worm for young Eucalyptus plantations with Eucalyptus clones in central Guangxi,and ensure the healthy development of the industry,through field investigation and control experiment,results showed that Eucalyptus urophylla × E. tereticornis DH201-2 was damaged seriously,belonging to high susceptible variety. Eucalyptus grandis × E. urophylla GL9 and E. urograndis DH32-29 were damaged lightly,belonging to light susceptible variety. E. urograndis DH32-26 suffered slightly,belonging to the insect resistant variety. The gall density fluctuation showed 3 peaks,appearing at May,July and October. By using deltamethrin and thiacloprid fungicide,gall loss rates were 52. 94% and 74. 79%,with the significant control effect compared with control. By the total elimination of high susceptible variety Eucalyptus urophylla × E. tereticornis DH201-2,gall loss rate of Eucalyptus grandis × E. urophylla GL9 could reach81. 58%,significantly reducing the damage of Leptocybe invasa.